. Fishes. Fishes. 56 Adaptations of Fishes In certain groups (wrasse-fishes, parrot-fishes, etc.) in the tropics, individual fishes are sometimes rendered poisonous by feeding on poisonous mussels, holothurians, or possibly polyps, species which at certain times, and especially in their spawning season, develops alkaloids which themselves may cause cigua- tera. In this case it is usually the very old or large fishes which are Hable to be infected. In some markets numerous species are excluded as suspicious for this reason. Such a list is in use in the fish-market of Havana, where the sale of c
. Fishes. Fishes. 56 Adaptations of Fishes In certain groups (wrasse-fishes, parrot-fishes, etc.) in the tropics, individual fishes are sometimes rendered poisonous by feeding on poisonous mussels, holothurians, or possibly polyps, species which at certain times, and especially in their spawning season, develops alkaloids which themselves may cause cigua- tera. In this case it is usually the very old or large fishes which are Hable to be infected. In some markets numerous species are excluded as suspicious for this reason. Such a list is in use in the fish-market of Havana, where the sale of certain species, elsewhere healthful, or at the most suspected, was rigidly. Fig. 40 —The Trigger-fish, Balistes carolinensis GmeUn. New York. prohibited under the Spanish regime. A list of these suspicious fishes has been given by Prof. Poey. In many of the eels the serum of the blood is poisonous, but its venom is destroyed by the gastric juice, so that the flesh may be eaten with impunity, unless decay has set in. To eat too much of the tropical morays is to invite gastric troubles, but no true ciguatera. The true ciguatera is produced by a specific poisonous alkaloid. This is most developed in the globefishes or puffers {Tetraodon, Spheroides, Tropidichthys, etc.). It is present in the filefishes (Monacanthus, Alutera, etc.), prob- ably in some toadfishes (Batrachoides, etc.), and similar com- pounds are found in the flesh of sharks and especially in sharks' Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jordan, David Starr, 1851-1931. New York, H. Holt and Company
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